Queen of Scotland at six days old. Queen of France at seventeen years old. A widow at eighteen. The young and trusting Mary, Queen of Scots, is sailing home to her kingdom after years in exile. The danger from her cousin, the English Queen, has not lessened since then. Religious divides threaten to tear the nation apart and, across the border, Elizabeth keenly watches this new threat to her throne. Amid the furious turmoil and uncertainty in her Scottish...